Brake-actuating mechanism



Nov. 18, 1924.

R. E. c. DELEVOYE ET AL BRAKE ACTUATING MECHANISM Original Filed Jan. 3.1923 Patented Nov. 18, 1924.

UNITED STATES PATENT OFFICE.

ROBERT EMILE CHARLES DELEVOYE, OF PARIS, AND EMILE ALBERT FRANQOIS DU-MAINE, OF N EUILLY-SUB-SEIN E, FRANCE, ASSIGNOIt-S TO SOCIETE ANO'NYIVEEDES ANCIENS ETABLISSEMENTS HOTCHKISS 8c CIE., OF LEVALLOIS-PERRET,SEINE,

FRANCE.

BRAKE-AGTUATING MECHANISM.

Original application filed January 3,1923, Serial No. 610,493. Dividedand this application filed December 12, 1923.

To all whom it may concern Be it known that we, ROBERT EMILE CHARLESDnLnvoYn and EMILE ALBERT FRANgoIs DUMAINE, engineers, citizens of theRepublic of France, residing, respectively, at 6 Rue Cavalotti, Paris,Seine, France, and 59 Boulevard de la Saussaye, Neuilly-sur-Seine,Seine, France, have invented new and useful Improvements inBrake-Actuating Mechanisms, of which the following is a specification.

This application is a division of our application'for Letters Patentfiled January 3, 1923, Serial No. 610,493.

The present invention relates to a brakeactuating device for the frontwheels of automobiles and for other uses, said actuating device beingconstructed in such a manner as to eliminate the influence of the0scillations of the supporting springs on said actuating device itself,and consequently upon the braking action.

The actuating device according to the invcntion is characterized by thefact that there is interposed, in the transmission mechanism between theoperating member and the braking device proper, a compensatingmechanism, the displacement of which, caused by the movements of thefree end of the spring, neutralizes the effects of tension andrelaxation produced in the transmission mechanism by the oscillations ofthe spring.

According to the present invention the brake pedal acts upon a cable,connected on each side of the chassis of the vehicle, to a lever whichis keyed upon a shaft mounted upon the axle, and actuates the brakesituated upon the same side as this lever, this cable passing inopposite direc tions over two pulleys, one of which is mounted upon thechassis while the other is mounted upon the extremity of the shackle forthe spring.

The invention is shown diagrammatically and by way of example in theaccompanying drawing in which:

Fi 1 shows an actuating mechanism for the front brakes of automobiles inwhich cables are used;

Fig. 2 is a section along line 22 of Fig. 1;

Serial No. 680,212.

Fig. 3 shows an actuating mechanism, gimlilar to that of Fig. 1, butslightly modi- Fig. 4 is a section along line H of Fig. 3.

Referring first to Figs. 1 and 2: A shaft E parallel to the axle N andjournalled in the chassis of the vehicle is actuated by a pedal A in anysuitable manner and, for example, through the intermediary of a lever Bkeyed upon the same shaft as the pedal A, a lever D keyed upon the shaftE and an adjustable link 0 connecting the extremities of the levers Band D. The shaft E carries at each extremity a lever F and these twolevers F are keyed on this shaft. Eaph lever F carries a pulley G at itsfree enc.

Since the mechanism to be described below is the same on each side ofthe chassis, only the mechanism for one side of the chassis will bedescribed.

The shaft E is hollow and a cable H passes longitudinally therethroughand is then led over the pulleys G on each side of the chassis. Thecable H then passes in opposite directions over two pulleys J and K; thepulley J is carried by the chassis and the pulley K is mounted upon theshackle L of the spring M. The spring M is mounted in the usual mannerin the spring carrier-arm and is fixed to the axle N. The

pulley K is preferably mounted concentri cally to the axis of the springL which passes through the shackle L. The extremity of the cable H isfixed to the extremity of a lever O keyed upon a rock shaft 0 mounted onthe axle N. The shaft 0 actuates the brake situated upon the same sideas said shaft by means of a suitable device.

The method of operation is as follows:

When the spring M yields, the axle N and, in consequence, the lever 0move a certain distance towards the right in such a manner that thelever O approaches the shaft E, the effect of which would be to relaxthe cable H if the device according to the invention did not intervene.At the same time as the lever O approaches the shaft E b a certainamount, thepulley K, approac es the pulley J by substantially doublethis amount (oscillating about the upper point of suspension L or theshackle L) the horizontal displacement of the shaft L being double thatof the centre P of the spring M. This movement of the. pulley Kincreases the arc of contact of the cable H around the pulleys J and Kand it will be seen that, by suit-ably selecting the diameters and thedistance apart of the pulleys J and K as well as, eventually, theposition of the pulley K on the link L, this increase in the are oi?contact of the cable H compensates for the coming together of O and E.The horizontal movements of the lever 0 will then have no effect uponthe tension of the cable H and in consequence they will not affect thebraking action and will not react upon the pedal A, which reaction isextremely disagreeable and tiring for the driver.

It is evident that the device also operates when the spring M bends inthe opposite direction, that is to say, when the effect of the bendingof the spring is to move the lever O away from the shaft E in thedirection opposite to that shown by the arrow in Figure 1. In this case,the arc of contact of the cable H upon the pulleys J and IQ diminisheswhich fact compensates for the increase of the distance between 0 and E.

The invention has only been shown and described by way of a purelyexplanatory example, which is in no way limitative, and

it is to be understood that it is applicable to other cases than the oneselected by way of example. In a general way it is applicable to theactuation of any organs fixed upon a movable support connected by a leafspring to a fixed frame which carries the device for actuating saidorgans.

Furthermore, the details of the actuating mechanism described, could bemodified according to practical requirements without departing from thespirit of the invention. For instance, the cable H could be fixed to thelevers F, and the oscillating link L of the spring M could be replacedby a slide having a rectilinear movement with respect to the chassis asshown in Figs. 3 and i.

VVeclaim:

1. A brake actuating mechanism comprising in combination; with achassis: a suspension spring for an axle, a movable support for the freeend of said spring, a brake pedal mounted on said chassis, abrake-mechanism for wheels mounted on said axle, cables connecting saidbrake-pedal to, said bralreanechanism, a pulley carried by said movablesupport, a second pulley mounted on the chassis adjacent said firstpulley, said cable being led over said pulleys in o posite directionsand said pulleys being so ocated that the movements of the spring alterthe arc of contact of the cable with said pulleys.

2.1M brake actuating mechanism comprising in combination with a chassisa suspension spring for an axle, a movable support for the free end ofsaid spring, a bra e pedal mounted on said chassis, a brake mechanismfor wheels 'mounted on said axle, cables connecting said brakepedal tosaid brake-mechanism and means rotatably connected to said movablesupport, at the point of connection thereof with the free end of thespring, for nullifying the effect of the oscillations of said springupon said cables.

3. A brake-actuating mechanism, comprising in combination a suspensionspring for an axle, a brake pedal, a cable connected to said brakepedal, a brake operating lever mounted on the axle, the end of saidcable being connected to said lever, a pulley carried by the free end ofsaid spring, a second pulley mounted on the chassis, said cable beingled over said pulleys in opposite directions.

4. A brake-actuating mechanism, comn-isin in combination a sus ension srine l b n) for an axle, a brake-pedal, a brake-operat-' ing levermounted on the axle, a cable connectiug said pedal to said brakeoperating lever, a pulley connected to the free end of said spring, asecondpulley mounted on the chassis, said cable passing over saidpulleys in opposite directions and said pulleys being located so thatthe movements of the spring alterthe arc of contact of the cable withthe pulleys.

5. A. brakeactuating mechanism comprising in combination with a chassis:a suspension spring for anaxle, a movable support for the free end ofsaid spring, a brake pedal mounted on said chassis, a brake mechanismfor wheels mounted on said axle, cables connecting said brake-pedal tosaid brake mechanism, a pulley carried by the "free end of said spring,a second pulley mounted on the chassis, said cable being led over saidpulleys in opposite di rections.

6. A brake-actuating mechanism comprising in combination with a chassis:a suspension spring for an axle, a movable support for the free end ofsaid spring, a brake pedal mounted on said chassis, a brake mechanismfor wheels mounted on said axle, cables connecting said brakepedal tosaid brake mechanism, a pulley carried by the free end of said spring, asecond pulley mounted on the chassis, said cable being led over saidpulleys in opposite directions and said. pulleys being located so thatthe movements of the spring alter the arc of contact of the cable withthe pulleys.

7. A brake-actuating mechanism' comprising in combination suspensionsprings, a brake-pedal, a hollow shaft actuated by said brake-pedal, abrake-operating lever on each side of the automobile, a cable passingthrough said hollow shaft and having each end connected to one of saidbrake operating levers, a pulley carried by the free end of each of saidsprings, a second pulley mounted on the chassis adjacent each of saidfirst pulleys said cable passing in op 10 posite directions over saidpulleys.

ROBERT EMILE CHARLES DELEVOYE. EMILE ALBERT FRANCOIS DUMAINE.

